Method for constructing true earth surface dip angle trace gathers of seismic data

A technology of dip gathers and seismic data, which is applied in the field of construction of true surface dip gathers, can solve the problems of unreliable information of common reflection point gathers, cannot well describe the complex structure of underground imaging objects, etc., and achieves high computational efficiency. , The effect of good processing effect and broad application prospects

Active Publication Date: 2013-01-30
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

However, this time-domain imaging gather is still unable to describe the complex structure of the subsurface imaging object well, and under complex surface co

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  • Method for constructing true earth surface dip angle trace gathers of seismic data
  • Method for constructing true earth surface dip angle trace gathers of seismic data
  • Method for constructing true earth surface dip angle trace gathers of seismic data

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Embodiment Construction

[0019] Prestack depth migration is currently the only and most effective way to improve the lateral resolution of seismic data, but under complex geological conditions, a reasonable imaging gather of components is crucial to the processing results. Conventional common reflection point gathers can only use the simplest geological model in the time domain, while the recently proposed angle gathers are usually only based on the same reflection angle, which also cannot reflect the real situation of the underground structure well. Therefore, a new method for constructing dip gathers of true surface seismic data is proposed.

[0020] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0021] figure 1 is a flow chart showing a method for constructing a true surface seismic data dip gather.

[0022] refer to figure 1 , the method for constructing dip gathers of real surface seismic data in the present invention includes th...

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Abstract

The invention relates to two-dimensional and three-dimensional wave equation prestacking depth migration processing during seismic data processing, in particular to a method for constructing true earth surface dip angle trace gathers of seismic data. The method comprises the following steps of (a) exciting a seismic wave on the true earth surface and calculating travel time of the seismic wave by means of a ray tracing method; (b) calculating a first incident angle of a first imaging point by means of a bending method in the ray tracing method and calculating a first reflection angle according to a velocity model of imaging space; and (c) constructing a dip angle according to the travel time, the first reflection angle, a preset angle range and a preset angle scanning interval, wherein at this time, a detector at the position of a receiving point receives reflection signals of the seismic wave changing along with the constructed dip angle to form a dip angle trace gather, and the dip angle trace gathers of other imaging points can be formed in the same way.

Description

technical field [0001] The invention relates to a two-dimensional and three-dimensional wave equation pre-stack depth migration processing in the process of seismic data processing, in particular to a method for constructing true surface dip angle gathers used for pre-stack depth migration processing. Background technique [0002] Research on migration imaging methods in complex areas is a frontier research topic that has existed for a long time in petroleum geophysical exploration and has not yet been fully resolved. The construction method of imaging gathers directly affects the final imaging quality. The current gather construction research is still based on the theoretical assumption of the horizontal stratification of the geological model, and many theoretical and practical results have been obtained. However, most of the current research focuses on the following two aspects. [0003] (1) Construct common reflection point gathers to deal with prestack time migration im...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 罗红明何光明陈爱萍曹中林张华刘奇琳
Owner BC P INC CHINA NAT PETROLEUM CORP
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